(testsuite) Remove need specify `./' with run args

This allows running tests as:

    ./run unit/_filedir.exp

instead of

    ./run ./unit/_filedir.exp

test/run

@@ -44,7 +44,7 @@ while [[ $# > 0 ]]; do
         --timeout=*) timeout=${1/--timeout=};;
         --tool=*) set_tool "${1#/--tool=}";;
         --tool) shift; set_tool "$1";;
-        */completion/*.exp|*/unit/*.exp)
+        completion/*.exp|*/completion/*.exp|unit/*.exp|*/unit/*.exp)
             arg=${1%/*}
             set_tool "${arg##*/}"
             args+=("${1##*/}")